public static unsafe SoundEffect Decode(byte *start, byte *end)
{
FakeFile file = new FakeFile {
start = start, position = start, end = end
};
int sampleCount = *(int *)file.position; // <- We encoded this, before the packets start, because Vorbis doesn't know [not sure if this is still true for Ogg, haven't checked -AR]
file.position += 4;
int loopStart = *(int *)file.position;
file.position += 4;
int loopLength = *(int *)file.position;
file.position += 4;
// TODO: Consider modifying vorbisfile binding so we can stackalloc `vf`
IntPtr vf;
Vorbisfile.ov_open_callbacks((IntPtr)(&file), out vf, IntPtr.Zero, IntPtr.Zero, staticCallbacks);
Vorbisfile.vorbis_info info = Vorbisfile.ov_info(vf, 0);
byte[] audioData = new byte[sampleCount * info.channels * 2]; // *2 for 16-bit audio (as required by XNA)
fixed(byte *writeStart = audioData)
{
byte *writePosition = writeStart;
byte *writeEnd = writePosition + audioData.Length;
while (true)
{
int currentSection;
int result = (int)Vorbisfile.ov_read(vf, (IntPtr)writePosition, (int)(writeEnd - writePosition), 0, 2, 1, out currentSection);
if (result == 0) // End of file
{
break;
}
else if (result > 0)
{
writePosition += result;
}
if (writePosition >= writeEnd)
{
break;
}
}
Debug.Assert(writePosition == writeEnd); // <- If this fires, something went terribly wrong. (TODO: Throw exception?)
}
Vorbisfile.ov_clear(ref vf);
return(new SoundEffect(audioData, 0, audioData.Length, (int)info.rate, (AudioChannels)info.channels, loopStart, loopLength));
}
void Dispose(bool disposing)
{
if (disposing)
{
Stop();
soundStream.Dispose();
soundStream = null;
Vorbisfile.ov_clear(ref vorbisFile);
}
IsDisposed = true;
}
